fix undefined

index.js

@@ -34,7 +34,8 @@ class CoBoxConfig {
     mkdirp.sync(path.join(this.root, 'logs'))
     mkdirp.sync(this.secrets)
 
-    var config = opts.seeds || defaultConfig()
+    var config = Object.assign(defaultConfig(), opts.seeds || {})
+
     if (!fs.existsSync(this.storage)) {
       fs.writeFileSync(this.storage, yaml.safeDump(defaultConfig(), { sortKeys: true }))
       this._groups = config.groups